The purpose of this manual is to assist Dealers and
Agents in the efficient installation, maintenance and
repair of AGCO equipment. Carrying out the procedures as detailed, together with the use of special
tools where appropriate, will enable the operations to
be completed within the time stated in the Repair Time
Schedule.

When parts have to be replaced, it is essential that only
genuine AGCO parts are used.
The following points are of particular importance when
carrying out repairs and fitting replacement parts and
accessories.
Tractor safety features may be impaired if non-genuine
parts are fitted.
Legislation in certain countries prohibits the fitting of
parts that do not comply with the tractor manufacturerâ&#x20AC;&#x2122;s specifications. Torque wrench setting figures
given in the Workshop Service Manual must be strictly
adhered to. Locking devices must be fitted where
specified. If the efficiency of a locking device is
impaired during removal, it must be replaced.
The tractor warranty may be invalidated if non-genuine
AGCO parts are fitted. All AGCO spare parts have the
full backing of the manufacturerâ&#x20AC;&#x2122;s warranty. AGCO
Dealers and Agents are required to supply only
genuine service parts.

B . Structure of the manual
Page numbering
The present manual is divided into chapters and
sections, and each page is numbered with the
following information:
Example: 10A12.1
10 = Chapter
A12 = Section
1 = Page number within the section
The issue number is indicated at the bottom of the
page.

Contents
For quick reference, each chapter starts with a table of
contents, listing the various sections included in that
chapter.

Meaning of references
(..) : identification of parts and components

Amendments
Amended pages will be issued carrying the same page
number as the former pages: only the version number
will change.
Former pages should be destroyed.

C . Service tools
Where the use of a service tool is necessary to carry
out an operation, the tool reference is mentioned
following the relevant instruction.
Drawings for locally made tools are given at the end of
the relevant sections.

B . Retaining compounds and
sealing products
The Loctite compounds mentioned in this manual are
referred to by their industrial name.
For repair purposes, use their commercial names or
the corresponding AGCO references listed in the
following table:
Loctite industrial
name

Application method for Loctite products
1. Remove all traces of previous sealants and corrosion
- mechanically: wire brush or emery cloth
- chemically: "DECAPLOC 88"
Leave the product to take effect and then wipe
clean.
2. Degrease the components with dry solvent
- preferably, use “Super Solvant Sec LOCTITE
706”.
3. Allow the solvents to evaporate
4. Apply the recommended type of LOCTITE product
to the parts:
- for blind tapped holes, apply a quantity of the
product to the last threads at the bottom of the
hole
- for cylindrical fittings, apply the product on the
two mating faces using a clean brush
- for mating faces, apply a bead to one of the two
faces, circling the holes, and then tighten as
quickly as possible
NOTA:
- Do not use too much of the compound in order to
avoid locking adjacent parts.
- Do not attempt to retighten after 5 minutes of curing,
in order to avoid breaking the film of compound.
- If the ambient temperature is less than +10°C, and
to ensure quicker setting of Loctite compounds,
(except SILICOMET), use LOCTITE T 747 activator
on at least one of the two parts. Excess sealant
outside the joint will not harden (anaerobic curing of
the compound – i.e. curing takes place only in
absence of oxygen).

Grease
When grease is used in components which are in
contact with transmission oil, use grease which is
miscible with oil to avoid clogging the hydraulic filters.
Use "Amber Technical" grease supplied by: WITCO
company, 76320 Saint-Pierre des Elfes, France.

1C10.4

¤ H

Massey Ferguson 6400 - Issue 4.b

Miscellaneous

C . Tightening torques
Use the tightening torques for screws and nuts as indicated in the tables:
- 1 and 2 for metric threads
- 3 and 4 for inch-system threads
When a specific torque is required, it is stated in the
text.
Tables 1 and 3 indicate the nomal tightening torque
values to apply to threaded zinc-plated elements, with
normal nuts, with coarse or fine threads, with or
without a flat washer or lockwasher, and weldable
nuts more than 0.8 d high.
Tables 2 and 4 indicate the reduced tightening torque
values to apply to threaded elements in assemblies
with zinc-plated self-locking locknuts, phosphate-coated nuts and screws, thin nuts, waldable
nuts less than 0.8 d high.
These values are to be applied to dry assemblies. If the
threads are oiled, reduce the tightening torques.
NOTA: Read the tensile grade on the screw head to
determine the corresponding tightening torque.
Example:

A . General
The front frame and the engine must be disassembled
when each of the assemblies needs to be replaced, or
when servicing is necessary on one of the mechanical
elements located at the front of the engine.
Remark
This section presents a general disassembly procedure. Before and during disassembly, check that all
connections have been properly separated between
the fixed assembly and mobile assembly.

B . Disassembling and reassembling
(Perkins 6-cylinder engine)

Fig. 1

Preliminary operations
1. Apply the handbrake.
2. Ensure that the suspended front axle (if fitted) is in
raised position and position chocks between the
upper control arm and front axle housing (Fig. 1).
3. Remove the bleed screw from the control unit (see
chapter 9).
4. Remove the lateral panels from the engine and
bonnet.

Servicing under the tractor
5. Remove the guard and the shaft (4 WD tractors).
Fig. 2

Servicing on the right-hand side of the
tractor
6. Disconnect the batteries.
7. Mark then disconnect:
- the differential lock hoses on the front axle,
- the feed hose on the steering ram,
- the lubricating hoses (running to and from the
cooler) (Fig. 2).
8. Remove the protection grille close to the radiator.
9. Disconnect the air sleeve (1) (turbo outlet) from the
cooling sleeve (Fig. 3).

Fig. 3

02A01.2

Â¤ H

Massey Ferguson 6400 - Issue 2

Splitting - Front frame / Perkins engine
Servicing on the left-hand side of the
tractor
10. Mark then disconnect:
- the feed hose on the steering ram,
- the hoses (pressure-return and LS) on the rigid
tubes (Fig. 4) of the suspended front axle (if
fitted).
11. Remove the protection grille close to the radiator.
12. Disconnect the air sleeve (2) (intake on inlet manifold) from the cooling sleeve (Fig. 5).

Draining the cooling system
13. Unscrew the wing plug located on the left-hand
side and front of the radiator. Drain the liquid into a
clean container.

Fig. 4

If the engine is hot, gradually loosen the
expansion tank plug and remove it in order to
expel the pressure from the circuit.
14. Disconnect the lower radiator hose (1) and the
hose (2) linking the expansion tank to the base of
the radiator (Fig. 6).

Servicing at the front of the tractor
16. Remove the weights (if fitted).
17. Separate the compressor, the condenser and the
filter from their respective holders, and remove
them carefully, without breaking the circuit (see
chapter 12).
18. Mark and disconnect the wiring harnesses:
- inside the grille,
- on the control unit solenoid valves (suspended
front axle, if fitted).
19. Disconnect the air sleeves (3) (4) on the air cooler
located inside the grille (Fig. 8).

Fig. 7

Fig. 8

02A01.4

Â¤ H

Massey Ferguson 6400 - Issue 2

Splitting - Front frame / Perkins engine
Preparing for disassembling
20. Cancel the front axle oscillation (all versions) by
sliding a suitable chock in at each side of the
support (1) (Fig. 9).
21. Chock the rear wheels.
22. Install (Fig. 11):
- a mobile stand under the front axle beam,
- a suitable sling under the front of the frame,
- a fixed axle stand under the engine sump.

Disassembly
23. Remove lateral screws (1) (Fig. 10).
24. With the help of an operator, loosen the screws
(2)(3) (Fig.10), simultaneously moving the frame
away from the engine.

Fig. 9

When disassembling, use the sling to
reduce the risk of toppling of the front frame
assembly.

Screw dimensions
-

M16 x 55 mm
M16 x 60 mm
M16 x 115 mm
M20 x 190 mm
M24 x 200 mm

Reminder
When disassembling, check that connections (hoses,
pipes and harnesses) are all disconnected.

Massey Ferguson 6400 - Issue 2

Â¤ H

02A01.5

Splitting - Front frame / Perkins engine

Fig. 10

Fig. 11

02A01.6

Â¤ H

Massey Ferguson 6400 - Issue 2

Splitting - Front frame / Perkins engine
Reassembly
25. Clean the mating faces of the engine and front
frame.
Special point
For tractors fitted with a Perkins six-cylinder engine,
check with a ruler prior to assembly that the supports
(5) are in line with the front face of the lower engine
housing (Fig. 13). If they are not, adjust the support(s)
until they are correctly aligned. Tighten the screws to:
- (4) 240 - 320 Nm (Loctite 270 or equivalent),
- (6) 240 - 320 Nm.
Check correct alignment after tightening.
26. Screw a guide stud onto each rear face of the
frame (Fig. 12).
27. With the help of an operator, assemble the front
frame onto the engine. Take out the guide studs.
28. Fit and tighten the diametrically opposed screws
(Fig. 15) in the following order:
- Screw (2): 480 -640 Nm.
- Screw (3): 800 -1040 Nm.
- Screw (1): 240 -320 Nm.

Fig. 12

Final operations
Remark
Final operations are not especially difficult.
They should be carried out in the reverse order to
preliminary operations.
However, it will be necessary during reassembly to
carry out the tightening torques, adjustments and tests
described below.

C . Disassembling and reassembling
(Perkins 4-cylinder engine)
Reminder
There are two types of front frame. Each model corresponds to a specific engine type: Perkins engine with
mechanical injection or Perkins EEM engine with electronic injection.
The frames are different in shape and assembly.
Each front frame must be assembled to its corresponding engine.

Servicing under the tractor
31. Take off the guard, shaft and differential lock
supply pipe (4 WD tractors).

Servicing at the front of the tractor
32. Remove the front weights (if fitted).
33. Disconnect the batteries. Remove them if required
(Perkins engine with mechanical injection).
Tractors withâ&#x20AC;Ś

Battery location

Perkins engine with
mechanical injection

in the grille
compartment

Perkins EEM engine

behind the right-hand
footstep

Location of batteries
34. Detach the air conditioning compressor,
condensor and filter from their respective supports
(if fitted).
Place the assembly beside the tractor without
disconnecting the pipes and hoses (see
chapter 12).

Servicing on the right-hand side of the
tractor
36. Mark and disconnect the feed hose on the steering
ram.
37. Mark and disconnect the lubricating hoses running
to and from the cooler (Perkins EEM engine Fig. 17).
38. Remove the protection grille close to the radiator.
39. Disconnect the air sleeve (1) (turbo outlet) from the
cooling sleeve (Perkins EEM engine - Fig. 18).

Fig. 16

Fig. 17

Fig. 18

02A01.10

Â¤ H

Massey Ferguson 6400 - Issue 2

Splitting - Front frame / Perkins engine
Servicing on the left-hand side of the
tractor
40. Mark and disconnect the feed hose on the steering
ram.
41. Remove the protection grille close to the radiator.
42. If necessary, disconnect the air sleeve (2) from the
cooler inlet (intake manifold inlet - Perkins EEM
engine - Fig. 19).

Draining the cooling system
43. Unscrew the wing plug located on the front
left-hand side of the radiator, to drain the circuit.

If the engine is hot, gradually loosen
the expansion tank plug and remove it in order
to release the pressure from the circuit.

Fig. 19

44. Disconnect the lower radiator hose (1) and the
hose (2) linking the expansion tank to the base of
the radiator (Fig. 20).

Splitting - Front frame / Perkins engine
Preparing for disassembling
46. Stop the front axle oscillation by sliding a suitable
wooden chock either side of the support (1)
(Fig. 22).
47. Chock the rear wheels.
48. Install (Fig. 25):
- a mobile stand under the front axle beam,
- a suitable sling under the front of the frame,
- a fixed axle stand under the engine sump.

Disassembly
Reminder
Before disassembling:
- check that the unions (hoses, pipes and harnesses)
are all disconnected;
- note the position and location of chocks (1) inserted
between the engine sump and front frame (Perkins
EEM engine - Fig. 23).

Fig. 22

49. Loosen and remove (Fig. 24):
- for Perkins engine with mechanical injection:
screws and bolts (2), (4) and (1),
- for Perkins EEM engine: screws and bolts (2),
(3), (4) and (1).
With the help of an operator, gradually separate
the engine front frame at the same time (Fig. 25).

When disassembling, also use the
sling to reduce the risk of toppling of the front
frame assembly (Fig. 25).
Fig. 23

Reassembly
Advice for use
Use guide studs to assist reassembly of the front
frame and engine.
50. Clean the mating faces of the engine and front
frame.
51. Screw two guide studs (1) to the front mating face
of the engine (Fig. 26).
52. With the help of an operator, assemble the front
frame onto the engine as follows:
• Front frame and Perkins engine with mechanical injection (Fig. 27)
53. Fit screws (2), (4) and nuts (1), simultaneously taking out the guide studs.
54. Tighten opposing screws and nuts to a
torque of 240 - 320 Nm in the following order
(2) (4) (1).
• Front frame and Perkins EEM engine (Fig. 28)
Reminder
If it is necessary to chock the front frame, refer
to § D.
55. Fit screws (2), (3) and (4) and nuts (1), simultaneously taking out the guide studs.
56. Tighten opposing screws and nuts to a
torque of 240 - 320 Nm in the following order
(2) (3) (4) (1).

D . Shimming the front frame
(Perkins 4-cylinder EEM engine)
Special point
When the front frame is fitted to the Perkins EEM
engine, the mating face of the engine sump is not in
contact with the mating face of the front frame. It is
therefore advised to fill this space with shims (1)
(Fig. 30) whose thickness will be measured and set
afterwards.
Reminder
Shimming should only be carried out if the front frame
and or engine has / have been replaced.
57. With the help of an operator, assemble the front
frame onto the engine.

Fig. 30

Preparing for shimming (Fig. 31)
58. Fit only screws (4) and nuts (1), simultaneously
taking out the guide studs.
59. Tighten opposing screws and nuts to a torque
of 240 - 320 Nm in the following order (4) (1).

Fig. 31

02A01.16

Â¤ H

Massey Ferguson 6400 - Issue 2

Splitting - Front frame / Perkins engine
Shimming
Important
To avoid applying undue loads to the mating faces
during shimming, avoid adjusting the safety
stands placed under the engine and front frame
during disassembly.
60. Using two stacked shims (1), each at least
2.30 mm thick (Fig. 32), measure the gap between
the mating faces of the engine sump and front
frame.
Determine the thickness of shims to be fitted by
increasing, as required, the thickness of each shim
until they fit tightly in the gap.
Remark
Shimming is carried out using shims between 2.30
and 2.60 mm thick.

Fig. 32

Inserting shims between the front frame and the
engine
61. Slightly loosen the screws (4) and bolts (1)
(Fig. 31).
62. Position the shims (1): the end E should be turned
downwards.
Insert them between the front frame and the
engine sump (Fig. 32).
63. Fit screws (2) and (3) (Fig. 33).
64. Tighten opposing nuts and all screws of the front
frame to a torque of 240 - 320 Nm in the following
order (2) (3) (4) (1) (Fig. 33).
65. Release the safety stands.
Fig. 33

A . General
The front frame and engine must be disassembled
when the assemblies need to be replaced, or when
servicing is necessary on one of the mechanical
elements located at the front of the engine.
Remark
This section presents a general disassembly procedure. Before and during disassembly, check that all
connections have been properly separated between
the fixed assembly and mobile assembly

B . Disassembling
Preliminary operations

Fig. 1

1. Put on the handbrake if necessary.
Remark
Putting on the handbrake is optional because the Park
Lock mechanism (option) automatically immobilises
the tractor when stationary.
2. Ensure that the suspended front axle (if fitted) is in
raised position and position chocks between the
upper control arm and front axle housing (Fig. 1).
Remove the bleed screw from the control unit (see
chapter 9).
3. Remove the lateral panels from the engine and
bonnet.

Servicing under the tractor
4. Remove the guard and the 4WD shaft located
under the engine.

02A02.2

Â¤ H

Massey Ferguson 6400 - Issue 1

Splitting - Front frame / Sisu engine
Servicing on the right-hand side of the
tractor
5. Disconnect the batteries.
6. Mark then disconnect:
- the differential lock hoses on the front axle,
- the feed hose on the steering ram,
- the lubricating hoses running to and from the
cooler (Fig. 2).
7. Remove the protection grille close to the radiator.
8. Disconnect the air sleeve (1) (turbo outlet) from the
cooling sleeve (Fig. 3).

Servicing on the left-hand side of the
tractor
9. Mark then disconnect:
- the feed hose on the steering ram,
- the hoses (pressure-return and LS) on the rigid
tubes (Fig. 4) of the suspended front axle (if fitted).
10. Remove the protection grille close to the radiator.

Draining the cooling system
12. Unscrew the wing plug located on the left-hand
side and front of the radiator. Drain the liquid into a
clean container.

If the engine is hot, gradually loosen the
expansion tank plug and remove it in order to drive the
pressure from the circuit.
13. Disconnect the lower radiator hose (1) and the
hose (2) linking the expansion tank to the base of
the radiator (Fig. 6).

Servicing at the front of the tractor
15. Remove the weights (if fitted).
16. Separate the compressor, the condenser and the
filter from their respective holders, and remove
them carefully, without breaking the circuit (see
chapter 12).
17. Mark and disconnect the wiring harnesses:
- inside the grille,
- on the control unit solenoid valves (suspended
front axle, if fitted).

Fig. 6

Fig. 7

02A02.4

Â¤ H

Massey Ferguson 6400 - Issue 1

Splitting - Front frame / Sisu engine
18. Disconnect the air sleeve (3)(4) on the air cooler
located inside the grille (Fig. 9).

Preparing for disassembling
19. Cancel the front axle oscillation (all versions) by
sliding a suitable chock in at each side of the
support (1) (Fig. 8).
20. Chock the rear wheels.
21. Install (Fig. 11):
- a mobile stand under the front axle beam,
- a suitable sling under the front of the frame,
- a fixed axle stand under the engine sump.

Disassembling
22. Remove lateral screws (1) (Fig. 10).
23. With the help of an operator, loosen the screws
(2)(3) (Fig.10), simultaneously moving the frame
away from the engine.

Fig. 8

When disassembling, use the sling to
reduce the risk of toppling of the front frame assembly.

Remark
Final operations are quite simple, and should therefore
be carried out in the reverse order to preliminary operations.
However, it will be necessary during reassembly to
carry out the tightening torques, checks and tests
described below.

A . General
The front frame and engine must be split when the
assemblies need to be replaced, or when servicing is
necessary on one of the mechanical elements located
at the front of the engine.
IMPORTANT: This section presents a general disassembly procedure. Before and during disassembly,
check that all connections have been properly separated between the fixed assembly and mobile
assembly.

Massey Ferguson 6400 - Issue 4.a

Â¤ H

2A30.3

Splitting the front frame/Sisu engine - MF 6497-6499

B . Disassembly
Preliminary operations
1. Apply the handbrake.
2. Check that the suspended front axle (if fitted) is in
high position.
Position chocks between the upper control arms
and front axle housing (Fig. 1).
3. Remove the bleed screw from the control unit (if
fitted, see chapter 9).
4. Take off:
- the side panels either side of the engine,
- the bonnet (if necessary).
MA-02-05110A

Fig. 1

Servicing under the tractor
5. Mark then disconnect the two ends of the hoses
fixed to the 4 WD transmission shaft guards (front
and rear). Block their openings.
6. Remove the guards and 4 WD transmission shaft.

Servicing on the right-hand side of the
tractor
7. Disconnect the batteries.
8. Take off:
- the front mudguard;
- the vertical exhaust assembly (including
support);
- the side engine reinforcement;
- the protection grille close to the radiator.
9. Disconnect:
- the turbocharger outlet air sleeve (1) (Fig. 2);
- the flexible air filter sleeve.

1

Fig. 2

MA-02-05111A

MA-02-05112A

2

2A30.4

Â¤ H

Fig. 3

Massey Ferguson 6400 - Issue 4.a

Splitting the front frame/Sisu engine - MF 6497-6499
Servicing on the left-hand side of the
tractor
10. Remove the front mudguard.
11. Remove or move the fuel tank apart the side of the
tractor.
12. Take off:
- the side engine reinforcement;
- the protection grille close to the radiator.
13. Disconnect the intake air manifold sleeve (2)
(Fig. 3).
14. Disconnect (Fig. 4):
- the rigid pipes (1) (pressure, return and LS) to the
suspended front axle (if fitted);
- the rigid pipes (2) to the front linkage (if fitted).

MA-02-05113A

1

2

Fig. 4

Draining the cooling system
15. Unscrew the wing plug (1) located on the left-hand
side and front of the radiator (Fig. 5). Drain the
liquid into a clean container.

DANGER: If the engine is hot, before
loosening the wing plug (1), gradually loosen
the expansion tank plug and remove it in order
to expel the pressure from the circuit.
16. Disconnect the lower radiator hose (1) and the
hose (2) linking the expansion tank to the base of
the radiator (Fig. 6).

1

MA-02-05114A

Fig. 5

Fig. 6

Massey Ferguson 6400 - Issue 4.a

Â¤ H

2A30.5

Splitting the front frame/Sisu engine - MF 6497-6499
Servicing above the engine
17. Take off:
- the sleeve (3) and the rigid air sleeve (5) of the air
cooler inlet (Fig. 7);
- the sleeve (4) and the rigid air sleeve (6) of the air
cooler outlet (Fig. 8);
18. Disconnect:
- the flexible particle suction sleeve between the
air filter and the exhaust;
- the lubricating pipes/hoses connecting the rear
axle right-hand hydraulic cover to the oil cooler.
19. Disconnect:
- the thermostatic fan ENG 19 connector;
- the upper hose (1) and the hose (2) linking the
expansion tank to the top of the radiator (Fig. 9).

5

3

MA-02-05115A

Fig. 7

Servicing at the front of the tractor
20. Take off:
- the front weights (if fitted);
- the centre weight (if fitted).
21. Detach the air conditioning compressor,
condenser and filter from their respective
supports. Carefully keep them apart without
opening the circuit (see chapter 12).
IMPORTANT: If the air conditioning circuit should be
open, see chapter 12 before any action.
22. Mark and disconnect the wiring harnesses:
- inside the grille;
- on the control unit solenoid valves (suspended
front axle, if fitted).

6

4

Fig. 8

MA-02-05116A

2

1

MA-02-05117A

Fig. 9

2A30.6

Â¤ H

Massey Ferguson 6400 - Issue 4.a

Splitting the front frame/Sisu engine - MF 6497-6499
Disassembly
The lower screws M20x135 (2) and M24x165 (3),
attaching the front frame to the lower engine housing,
are not accessible on 4 WD tractors (Fig. 10). These
screws are facing the drive pinion carrier, which also
serves as a steering ram support.
Front frame / engine splitting takes place in two steps:
- first step: removing the front axle (fixed or
suspended);
- second step: splitting the front frame (radiators/cooler) from the engine

2
3

First step: removing the front axle (fixed or
suspended, see chapter 8)
23. Cancel the front axle oscillation (all versions) by
sliding a suitable chock in at each side of the frame
and front axle (1) (Fig. 11).
24. Chock the rear wheels.
25. Remove the front wheels.
26. Install (Fig. 12):
- a fixed stand at the front of and under the
gearbox;
- a fixed stand under the engine.

MA-02-05118A

Fig. 10

1

MA-02-05119A

Fig. 11

MA-02-05120A

Fig. 12
Massey Ferguson 6400 - Issue 4.a

Â¤ H

2A30.7

Splitting the front frame/Sisu engine - MF 6497-6499
27. Remove the suspended front axle control block (if
fitted, see chapter 9).
28. Remove (see chapter 8):
- the first bearing of the fixed or suspended
(according to version) front axle;
- the front axle.
Second step: splitting the front frame (radiators/cooler) from the engine.
29. Correctly sling and balance the front frame
assembly (radiators/cooler), using the tapped holes
drilled into each side of the front frame (Fig. 14).
30. Loosen one M16x85 side screw (1) on the left and
right-hand side of the engine (Fig. 13). Replace
with a guide stud of appropriate length.
31. With the help of an operator, loosen the screws (2)
(3) (Fig. 13).
32. Remove the front frame from the engine.
Screw dimensions (Fig. 13)
Screw
M16x85 (1)
M20x135 (2)
M24x165 (3)

2A30.8

Â¤ H

Massey Ferguson 6400 - Issue 4.a

Splitting the front frame/Sisu engine - MF 6497-6499

1

1

2

3
MA-02-05121A

MA-02-05122A

Massey Ferguson 6400 - Issue 4.a

Â¤ H

2

3
Fig. 13

Fig. 14

2A30.9

Splitting the front frame/Sisu engine - MF 6497-6499

C . Reassembly
33. Clean the mating faces of the engine and front
frame.
34. Screw a guide studs onto each rear face of the
front frame (Fig. 15).
35. With the help of an operator, assemble the front
frame onto the engine.
36. Tighten two screws (1) (Fig. 13).
Take out the guide studs.
Fit and tighten the diametrically opposed screws
(Fig. 13) in the following order:
- screws (1) to a torque of 240 - 320 Nm;
- screws (2) to a torque of 480 - 640 Nm;
- screws (3) to a torque of 800 - 1040 Nm.

MA-02-05123A

Fig. 15

2A30.10

Â¤ H

Massey Ferguson 6400 - Issue 4.a

Splitting the front frame/Sisu engine - MF 6497-6499
Final operations
Final operations are not especially difficult. They therefore will be carried out in the reverse order of the
preliminary operations.
However, the following operations need to be
performed during refitting:
- if necessary, tighten the screws or wheel nuts at the
required tightening torque (see chapter 6);
- make up the level of coolant, to the maximum level
marked on the expansion tank (Fig. 16);
- test:
- the air conditioning system (if fitted - see
chapter 12);
- the suspended front axle (if fitted, see chapter 8),
- all mechanical, hydraulic, electrical and electronic
functions concerned by servicing;
- check the tightness:
- of the hydraulic unions,
- of water hoses,
- of the bleed screw on control unit of suspended
front axle (if fitted).

A . General
On 6400 series tractors fitted with a GBA20 gearbox,
two types of engine may be fitted:
- Perkins 6-cylinder engine.
- Perkins 4-cylinder engine.
It is required to split the tractor between the engine
and the gearbox when access is necessary to carry out
servicing on the main following elements:

Gearbox interface
• Spacer and sealing ring
• Internal hydraulic pipes
• Reverse shuttle and Dynashift
Remark
- This section presents a general disassembly procedure. Before and during disassembly, check that all
connections have been properly separated between
the fixed assembly and mobile assembly.
- The cab remains attached to the centre housing.

Massey Ferguson 6400 - Issue 2

¤ H

02B01.3

Splitting - Perkins Engine / GBA20 Gearbox

B . Disassembling and reassembling
(Perkins 6-cylinder engine)
Preliminary operations
1. Apply the handbrake.
2. Check that the suspended front axle (if fitted) is in
low position and unscrew the control unit bleed
screw (see chapter 9).
3. Remove the lateral panels from each side of the
engine and bonnet (if necessary).

Servicing under the tractor
4. Remove the guard and the shafts (4 WD tractors).

Fig. 1

Servicing at the front of the tractor
5. Remove the front weights (if fitted).

Servicing on the right-hand side of the
tractor
6. Remove the footstep.
7. Disconnect and remove first the batteries and then
the support.
8. Disconnect the flexible sleeve (1) (Fig. 1) fitted to
the suction port. Remove the vertical exhaust
assembly (including support Fig. 2).
9. Mark then disconnect:
- the cables (positive and negative) on the starter,
- the front differential lock hose,
- the hose on the steering ram,
- the lubricating hoses (running to and from the
cooler) (Fig. 3).

Fig. 2

02B01.4

Â¤ H

Massey Ferguson 6400 - Issue 2

Splitting - Perkins Engine / GBA20 Gearbox
Servicing on the left-hand side of the
tractor
10. Remove the footstep.
11. Mark then disconnect:
- the hose on the steering ram,
- the hoses (pressure-return and LS) on the rigid
pipes (Fig. 4) of the suspended front axle (if
fitted).
12. Mark and disconnect the fuel feed and return
hoses on the engine (block ports immediately).
Remark
If the fuel tank is not removed it obstructs access to
the engine attachment screw on the spacer, but does
not prevent access. However, if there is a problem,
remove the tank having previously marked and disconnected:
- the gauge harness,
- the vent hose on the tank.

Fig. 3

Servicing under the cab
13. Mark, toe-in and disconnect the heating hoses,
immediately blocking the ports.

Fig. 4

Massey Ferguson 6400 - Issue 2

Â¤ H

02B01.5

Splitting - Perkins Engine / GBA20 Gearbox
Servicing the engine
14. If necessary disconnect the connector (1) of the
main wiring harness (Fig. 5).
15. Separate the compressor, the condenser and the
filter from their respective holders, and remove
them carefully, without breaking the circuit (see
chapter 12).
Remark
Work carefully.

Servicing at the front of the cab
16. Disconnect the connectors (2) on the left-hand
face of the fire wall (Fig. 5).

Fig. 5

Preparing for disassembling
17. Cancel the front axle oscillation (all versions) by
sliding a suitable chock in at each side of the
support (1) (Fig. 6).
18. Chock the rear wheels.
19. Install (Fig. 7):
- a fixed stand at the front of the gearbox,
- a mobile stand at the back of the engine.
20. If necessary, separate the cab from the front rightand left-hand supports. Gently lift it using two
straps fitted to the lateral handles. Fit a wooden
chock temporarily between the cab and the
supports.

Fig. 6

02B01.6

Â¤ H

Massey Ferguson 6400 - Issue 2

Splitting - Perkins Engine / GBA20 Gearbox
Disassembly
21. Remove the screws and nuts attaching the engine
to the gearbox (Fig. 8). Mark their lengths and positionings.
22. With the help of an operator, separate the assemblies (Fig. 7).
Reminder
When disassembling, check that connections (hoses,
pipes and harnesses) are all disconnected.

Reminder
If necessary, remove the starter and turn the flywheel
ring gear using a suitable tool. This will ease the
engagement of the vibration damper splines with
those of the main shaft. If there is resistance, do not
force it and find the cause of the problem.
28. When the elements are joined, remove the guide
studs (if fitted). Lightly grease the thread of the
screws and nuts with Loctite 270 or equivalent and
refit according to the marks made at disassembly.
Tighten to the required torques (Fig. 11)
- Screw (1): 240 - 320 Nm.
- Screw (2): 240 - 320 Nm.
- Screw (3): 630 - 840 Nm.
- Nuts (4): 100 - 130 Nm.
- Nuts (5): 630 - 840 Nm.

Massey Ferguson 6400 - Issue 2

Â¤ H

Fig. 10

02B01.9

Splitting - Perkins Engine / GBA20 Gearbox

Fig. 11

02B01.10

Â¤ H

Massey Ferguson 6400 - Issue 2

Splitting - Perkins Engine / GBA20 Gearbox
Final operations
Remark
Final operations are not especially difficult. They
should be carried out in the reverse order to preliminary operations. However, it will be necessary during
reassembly to carry out the tightening torques, adjustments and tests described below.
Tightening torques
As required:
• Front cab attachment screw (see chapter 12).
• Screw (2) of connector (1) on main wiring harness
(Fig. 5 and Fig. 12) 2.82 to 3.15 Nm
Topping-up
of coolant to the maximum level marked (radiator,
expansion tank. Fig. 13).

Servicing under the tractor
31. Take off the guard, shaft and differential lock
supply pipe (4 WD tractors).

Servicing at the front of the tractor
32. Remove front the weights (if fitted).
33. Disconnect the batteries.
Tractors withâ&#x20AC;Ś

Battery location

Perkins engine with
mechanical injection

in the grille
compartment

Perkins EEM engine

behind the right-hand
footstep

Location of batteries (Fig. 14)

Fig. 14

02B01.12

Â¤ H

Massey Ferguson 6400 - Issue 2

Splitting - Perkins Engine / GBA20 Gearbox
Servicing on the right-hand side of the
tractor
34. Take off the front right-hand mudguard.
35. Disconnect the flexible sleeve (1) (Fig. 15) fitted to
the suction port.
If necessary, remove the vertical exhaust
assembly (including support) (Fig. 15).
36. Mark then disconnect:
- the hose on the steering ram or on the spool
valve (Orbitrol), depending on the tractor type;
- the lubricating hoses (running to and from the
cooler) (Perkins EEM engine) (Fig. 16).

Servicing on the left-hand side of the
tractor

Fig. 15

37. Take off the front left-hand mudguard.
38. Mark then disconnect:
- the hose on the steering ram or on the spool
valve (Orbitrol), depending on the tractor type;
- the gas-oil supply and return hoses on the
engine. Immediately block the ports.
39. Disconnect the cables connected to the starter
positive terminal (Fig. 17).

Fig. 16

Fig. 17

Massey Ferguson 6400 - Issue 2

Â¤ H

02B01.13

Splitting - Perkins Engine / GBA20 Gearbox
Servicing under the cab

If the engine is still hot, allow it to cool.
Reminder
To work on heating hoses, it is not necessary to drain
the engine block cooling circuit.
40. Toe-in each heating hose using a clamp fitted with
plastic jaws (Fig. 18).

Servicing the engine
41. Mark and disconnect the heating hoses on the
engine block and water pump.
Immediately block the ports using suitable plugs.
42. Disconnect the negative cables on the block at the
rear left-hand side of the engine (Fig. 19).
43. If necessary disconnect the connector (1) of the
main wiring harness (Perkins EEM engine)
(Fig. 19).
44. Detach the air conditioning compressor,
condensor and filter from their respective supports
(if fitted).
Place the assembly beside the tractor without
disconnecting the pipes and hoses (see
chapter 12).
Note: Carry out this procedure with care.

Fig. 18

Fig. 19

02B01.14

Â¤ H

Massey Ferguson 6400 - Issue 2

Splitting - Perkins Engine / GBA20 Gearbox
Servicing at the front of the cab
45. Disconnect the connectors (2) and the ground
terminals (1) on the left-hand side of the cab wall
(Fig. 20).

Preparing for disassembling
46. Stop the front axle oscillation by sliding a suitable
wooden chock either side of the support (1)
(Fig. 21).
47. Chock the rear wheels.
48. Install (Fig. 22):
- a fixed stand at the front of the gearbox,
- a mobile stand at the back of the engine.
49. If necessary, separate the cab from the front rightand left-hand supports.
Gently lift the cab front using two straps fitted to
the lateral handles.

Fig. 20

Fix the cab in a raised position
Momentarily place a wooden chock between each
support and the cab right- and left-hand attachments.

Splitting - Perkins Engine / GBA20 Gearbox
Reassembly
Advice for use
Use guide studs to assist reassembly of the engine
and gearbox.
52. Clean the mating face of the engine adapter plate
and gearbox spacer.
53. Check for the presence of locating pins (1) on the
engine adapter plate (Fig. 24).
54. Lightly smear the splines of main shaft (1) (Fig. 25)
with AS767 grease or equivalent.
55. Screw two diametrically opposed guide studs to
the engine adapter plate or to the gearbox spacer.
56. Assemble the engine onto the gearbox spacer.
Reminder
If necessary, remove the starter and slowly turn
the flywheel ring gear using a suitable tool.
This will ease the engagement of the vibration
damper splines with those of the gearbox main
shaft.
If there is resistance, do not force it and find the
cause of the problem.
57. When the two assemblies are joined, remove the
guide studs (if fitted).
Lightly smear the thread of each of the screws (1)
and (2) with Loctite 270 or equivalent. Fit them as
marked at disassembly.
Tighten (Fig. 26):
- screws (1) to a torque of 240 - 320 Nm;
- screws (2) to a torque of 630 - 840 Nm.

Fig. 24

Fig. 25

02B01.18

Â¤ H

Massey Ferguson 6400 - Issue 2

Splitting - Perkins Engine / GBA20 Gearbox

Fig. 26

Massey Ferguson 6400 - Issue 2

Â¤ H

02B01.19

Splitting - Perkins Engine / GBA20 Gearbox
Final operations
Remark
Final operations are not especially difficult.
They should be carried out in the reverse order to
preliminary operations. However, it will be necessary
during reassembly to carry out the tightening torques,
adjustments and tests described below.
Tightening torques
As required:
- front cab attachment screw (see chapter 12),
- screw (2) of the connector (1) on the main harness
(Perkins EEM engine) (Fig. 19 and Fig. 27) to a
torque of 2.82 to 3.15 Nm.
Topping-up:
- of coolant, to the maximum level marked on the radiator and expansion tank (Fig. 28).

A . General
On 6400 series tractors fitted with a GBA 25 gearbox,
two types of engine can be fitted.
- Perkins six-cylinder engine.
- Perkins four-cylinder engine.
The tractor should be split between the engine and the
gearbox when access is necessary to carry out
operations on the following main elements:

Gearbox interface
• Spacer and sealing ring
• The Powershuttle, Step-up unit and Powershuttle
module
NOTE: This section presents a general disassembly
procedure. Before and during disassembly, check that
all connections between the fixed assembly and
mobile assembly have been disconnected.
The cab remains attached to the centre housing.

Massey Ferguson 6400 - Issue 4.a

¤ H

2B11.3

Perkins/GTA2520 engine separation

B . Disassembling and reassembling
(six-cylinder Perkins engine)
Implementation
1. Apply the handbrake.
2. Check that the suspended front axle (if fitted) is in
low position and unscrew the control unit bleed
screw (see chapter 9).
3. Remove the lateral panels from each side of the
engine and bonnet (if necessary).

Operations at the front of the tractor
6. Remove the front weights (if fitted).

Operations on the right-hand side of the
tractor
7. Remove the footplate.
8. Disconnect and remove the batteries then the
support.
9. Disconnect the flexible sleeve (1) (Fig. 1) fitted to
the suction port. Remove the vertical exhaust
assembly (including support Fig. 2).
10. Mark then disconnect:
- the cables (positive and negative) on the starter
- the front differential lock hose
- the hose on the steering ram
- the lubricating hoses (running to and from the
cooler) (Fig. 3)

Fig. 2

2B11.4

Â¤ H

Massey Ferguson 6400 - Issue 4.a

Perkins/GTA2520 engine separation
Operations on the left-hand side of the
tractor
11. Remove the footplate.
12. Mark then disconnect:
- the hose on the steering ram
- the hoses (pressure-return and LS) on the rigid
pipes (Fig. 4) of the suspended front axle (if
fitted)
13. Mark and disconnect the fuel feed and return
hoses on the engine (block ports immediately).
NOTE: If the fuel tank is not removed it obstructs
access to the engine screws on the spacer but does
not prevent access. However, if there is a problem,
remove the fuel tank having previously marked and
disconnected:
- the gauge harness
- the vent hose on the fuel tank

Fig. 3

Fig. 4

Massey Ferguson 6400 - Issue 4.a

Â¤ H

2B11.5

Perkins/GTA2520 engine separation
Operations under the cab

CAUTION: If the engine is still hot, allow it to
cool.

NOTE: To work on heating hoses, it is not necessary to
drain the engine block cooling circuit.
14. Pinch out each heating hose using a clamp fitted
with plastic jaws (Fig. 5).

Operations on the engine
15. If necessary, disconnect the connector (1) of the
main wiring harness (Fig. 6).
16. Separate the compressor, the condenser and the
filter from their respective holders, and remove
them without breaking the circuit (see chapter 12).

Fig. 5

NOTE: Proceed carefully.

Operations at the front of the cab
17. Disconnect the connectors (2) on the left-hand
face of the bulkhead (Fig. 6).

2B11.6

Â¤ H

Massey Ferguson 6400 - Issue 4.a

Perkins/GTA2520 engine separation
Preparing for disassembly
18. Stop the front axle swinging (all versions) by sliding
a suitable chock in at each side of the support (1)
(Fig. 7).
19. Chock the rear wheels.
20. Install (Fig. 8):
- a fixed stand at the front of the gearbox
- a mobile stand at the rear of the engine
21. If necessary, separate the cab from the front rightand left-hand supports. Gently lift it using two
straps fitted to the lateral handles. Temporarily
place a wooden chock between the cab and the
supports.

Fig. 6

Fig. 7

Massey Ferguson 6400 - Issue 4.a

Â¤ H

2B11.7

Perkins/GTA2520 engine separation
Disassembly
22. Remove the screws and nuts attaching the engine
to the gearbox (Fig. 9). Mark their lengths and
positionings.
23. With the help of an operator, separate the
assemblies (Fig. 8).
NOTE: When disassembling, check that all connections
(hoses, pipes and harnesses) are disconnected.

Dimensions of the screws, studs and nuts
Screws
-

M16 x 60 mm
M16 x 115 mm
M16 x 185 mm
M22 x 160 mm

Studs
- M22 x 160 mm
Nuts
- M22

Fig. 8

2B11.8

Â¤ H

Massey Ferguson 6400 - Issue 4.a

Perkins/GTA2520 engine separation

1

1

1

1

1

1

1

1

2

2

3

3

4

4

MA-02-03004A

Fig. 9
Massey Ferguson 6400 - Issue 4.a

Â¤ H

2B11.9

Perkins/GTA2520 engine separation
Reassembly
24. Clean the mating faces of the engine and the
gearbox spacer.
25. Check:
- the presence of dowels (1) on the engine
(Fig. 10),
- the tightness of the lower studs (M22) on the
gearbox spacer (Loctite 270).
26. Coat the input shaft splines of the gearbox lightly
with grease (GN+molykote type) or equivalent.
27. If necessary, screw two supplementary,
diametrically opposed guide studs into the
gearbox.
28. Assemble the engine onto the gearbox spacer.
NOTE: If necessary, remove the starter and turn the
flywheel ring gear using a suitable tool. This will ease
engaging the vibration damper splines with those of
the main shaft. If there is resistance, do not force it and
find the cause of the problem.

Perkins/GTA2520 engine separation
Final steps
NOTE: Final steps are not especially difficult. They
should be carried out in the reverse order to
preliminary steps. However, it will be necessary during
reassembly to carry out the tightening torques,
checks, adjustments and tests described below.
Tightening torques
As required:
• front cab screws (see chapter 12)
• screw (2) of connector (1) on main wiring harness
(Fig. 6 and Fig. 12) 2.82 to 3.15 Nm
Topping-up
of coolant to the maximum level marked (radiator,
expansion tank Fig. 13).

Operations at the front of the tractor
33. Remove the front weights (if fitted).
34. Disconnect the batteries.
Tractors withâ&#x20AC;Ś

Battery location

Perkins engine with
mechanical injection

in the grille
compartment

Perkins EEM engine

behind the right-hand
footstep

Location of batteries (Fig. 14)

Fig. 14

Massey Ferguson 6400 - Issue 4.a

Â¤ H

2B11.13

Perkins/GTA2520 engine separation
Operations on the right-hand side of the
tractor
35. Take off the front right-hand mudguard.
36. Disconnect the flexible sleeve (1) (Fig. 15) fitted to
the suction port.
If necessary, remove the vertical exhaust
assembly (including support) (Fig. 15).
37. Mark then disconnect:
- the hose on the steering ram or on the spool
valve (Orbitrol), depending on the tractor type
- the lubricating hoses (running to and from the
cooler) (Fig. 16)

Operations on the left-hand side of the
tractor

Fig. 15

38. Take off the front left-hand mudguard.
39. Mark then disconnect:
- the hose on the steering ram or on the spool
valve (Orbitrol), depending on the tractor type
- the fuel feed and return hoses on the engine.
Immediately block the ports.
40. Disconnect the cables connected to the starter
positive terminal (Fig. 17).

Fig. 16

Fig. 17

2B11.14

Â¤ H

Massey Ferguson 6400 - Issue 4.a

Perkins/GTA2520 engine separation
Operations under the cab

CAUTION: If the engine is still hot, allow it to
cool.

NOTE: To work on heating hoses, it is not necessary to
drain the engine block cooling circuit.
41. Pinch out each heating hose using a clamp fitted
with plastic jaws (Fig. 18).

Fig. 18

Massey Ferguson 6400 - Issue 4.a

Â¤ H

2B11.15

Perkins/GTA2520 engine separation
Operations on the engine
42. Mark and disconnect the heating hoses on the
engine block and water pump.
Block the ports immediately using suitable plugs.
43. Disconnect the negative cables on the block at the
rear left-hand side of the engine (Fig. 19).
44. If necessary, disconnect the connector (1) of the
main wiring harness (Perkins EEM engine)
(Fig. 19).
45. Detach the air conditioning compressor,
condenser and filter from their respective supports
(if fitted).
Place the assembly beside the tractor without
disconnecting the pipes and hoses (see
chapter 12).
NOTE: Carry out this action carefully.

Fig. 19

2B11.16

Â¤ H

Massey Ferguson 6400 - Issue 4.a

Perkins/GTA2520 engine separation
Operations at the front of the cab
46. Disconnect the connectors (2) and the ground
terminals (1) on the left-hand side of the cab
bulkhead (Fig. 20).

Preparing for disassembly
47. Stop the front axle swinging by sliding a suitable
wooden chock at each side of the support (1)
(Fig. 21).
48. Chock the rear wheels.
49. Install (Fig. 22):
- a fixed stand at the front of the gearbox
- a mobile stand at the rear of the engine
50. If necessary, separate the cab from the front rightand left-hand supports.
Gently lift the cab front using two straps fitted to
the lateral handles.

Fig. 20

Fix the cab in a raised position
Temporarily place a wooden chock between each
support and the cab right- and left-hand
attachments.

Fig. 21

Fig. 22
Massey Ferguson 6400 - Issue 4.a

Â¤ H

2B11.17

Perkins/GTA2520 engine separation
Disassembly
51. Remove the screws attaching the engine to the
gearbox (Fig. 23).
Mark their position and length.
52. Assisted by an operator, separate the assemblies
(Fig. 22).

Perkins/GTA2520 engine separation
Reassembly
Advice for use
Use guide studs to assist reassembly of the engine
and gearbox.
53. Clean the mating face of the engine adapter plate
and gearbox spacer.
54. Check for the presence of dowels (1) on the
engine adapter plate (Fig. 24).
55. Coat the input shaft splines of the gearbox lightly
with AS767 grease or equivalent.
56. Screw two diametrically opposed guide studs to
the engine adapter plate or to the gearbox spacer.
57. Connect the engine to the gearbox spacer.
Reminder
If necessary, remove the starter and slowly turn
the flywheel ring gear using a suitable tool.
This will ease engaging the vibration damper
splines with those of the gearbox main shaft.
If there is resistance, do not force it and find the
cause of the problem.
58. When the two assemblies are joined, remove the
guide studs (if fitted).
Lightly smear the thread of each of the screws (1)
and (2) with Loctite 270 or equivalent. Position
them according to the marks made during
disassembly.
Tighten (Fig. 25):
- screws (1) to a torque of 120 Nm
- screws (2) to a torque of 735 Nm

2B11.20

Â¤ H

Fig. 24

Massey Ferguson 6400 - Issue 4.a

Perkins/GTA2520 engine separation

1

1

1

1

1

1

1

2

2

2

2

MA-02-03003A

Fig. 25

Massey Ferguson 6400 - Issue 4.a

Â¤ H

2B11.21

Perkins/GTA2520 engine separation
Final steps
Note
Final steps are not especially difficult.
They should be carried out in the reverse order to
preliminary steps. However, it will be necessary during
reassembly to carry out the tightening torques,
adjustments and tests described below.
Tightening torques
As required:
- front cab screws (see chapter 12)
- screw (2) of the connector (1) on the main harness
(Perkins EEM engine) (Fig. 19 and Fig. 26) to a
torque of 2.82–3.15 Nm.
Topping-up

Gearbox interface
• Spacer, cover and sealing ring
• Internal hydraulic pipes
• Reverse shuttle and Dynashift
Remark
- This section presents a general disassembly procedure. Before and during disassembly, check that all
connections have been properly separated between
the fixed assembly and mobile assembly.
- The cab remains attached to the centre housing.

02B02.2

¤ H

Massey Ferguson 6400 - Issue 1

Splitting â&#x20AC;&#x201C; Sisu Engine / GBA10 Gearbox

B . Disassembly
Preliminary operations
1. Put on the handbrake if necessary.
Remark
Putting on the handbrake is optional because the Park
Lock mechanism (option) automatically immobilises
the tractor when stationary.
2. Check that the suspended front axle (if fitted) is in
low position and remove the control unit bleed
screw (see chapter 9).
3. Remove the side panels either side of the engine
and the bonnet (if necessary).

Fig. 1

Servicing under the tractor
4. Remove the chassis reinforcements (if fitted, see
chapter 2).
5. Remove the guard and the 4WD shafts.

Servicing at the front of the tractor
6. Remove the front weights (if fitted).

Servicing on the right-hand side of the
tractor
7. Remove the footstep.
8. Disconnect and remove first the batteries and then
the support.
9. Disconnect the flexible sleeve (1) (Fig. 1) joined to
the air filter, and remove the vertical exhaust
assembly (including support Fig. 2).
10. Mark then disconnect:
- the cables (positive and negative) on the starter,
- The front differential lock hose at both ends,
- the hose on the steering ram,
- the lubricating hoses (running to and from the
cooler) (Fig. 3).

Fig. 2

Massey Ferguson 6400 - Issue 1

Â¤ H

02B02.3

Splitting â&#x20AC;&#x201C; Sisu Engine / GBA10 Gearbox
Servicing on the left-hand side of the
tractor
11. Remove the footstep.
12. Mark then disconnect:
- the hose on the steering ram,
- the hoses (pressure-return and LS) on the rigid
pipes (Fig. 4) of the suspended front axle (if
fitted).
13. Mark and disconnect the fuel feed and return
hoses on the engine (block ports immediately).
Remark
If the fuel tank is not removed it obstructs access to
the engine attachment screw on the spacer, but does
not prevent access. However, if there is a problem,
remove the tank after marking and disconnecting it:
- the gauge harness,
- the vent hose on the tank.

Fig. 3

Servicing under the cab
14. Mark, toe-in and disconnect the heating hoses,
immediately blocking the ports.

Servicing the engine
15. Disconnect the connector (1) of the main wiring
harness (Fig. 5).
16. Separate the compressor, the condenser and the
filter from their respective holders, and remove
them carefully, without breaking the circuit (see
chapter 12).
Remark
- Work carefully.

Fig. 4

Fig. 5

02B02.4

Â¤ H

Massey Ferguson 6400 - Issue 1

Splitting â&#x20AC;&#x201C; Sisu Engine / GBA10 Gearbox
Servicing at the front of the cab
17. Disconnect the connectors (2) on the left-hand
face of the fire wall (Fig. 5).
18. If necessary, mark and disconnect the steering
ram hoses on the spool valve (orbitrol) (Fig. 6).

Preparing for disassembling
19. Stop the front axle oscillation (all versions) by
sliding a suitable chock in either side of the support
(1) (Fig. 7).
20. Chock the rear wheels.
21. Install (Fig. 9):
- a fixed stand at the front of the gearbox,
- a mobile stand at the back of the engine.
22. If necessary, separate the cab from the front rightand left-hand supports. Gently lift it using two
straps fitted to the lateral handles. Place a block
temporarily between the cab and the supports.

Fig. 6

Disassembly
23. Remove the screws and nuts attaching the engine
to the gearbox (Fig. 8). Mark their lengths and positionings.

C . Reassembly
25. Clean the mating faces of the engine and the
gearbox spacer.
26. Check the presence of locating pins (1) on the
engine (Fig. 10).
27. Lightly lubricate the splines of main shaft (1) (Fig.
11) with grease (type GN + Molykote) or equivalent.
28. Grease the mating face of the spacer with Loctite
5206 or equivalent.
29. Screw two diametrically opposed guide studs on
to the spacer.
30. Assemble the engine onto the gearbox spacer.
Reminder
- If necessary, manually turn the flywheel ring gear
using the port provided to fit the starter, using a suitable tool. This will ease the engagement of the vibration damper splines with those of the main shaft. If
there is resistance, do not force it and find the cause
of the problem.

Splitting – Sisu Engine / GBA10 Gearbox
Final operations
Remarks
Final operations are quite simple and should therefore
be carried out in the reverse order to preliminary
operations. However, it will be necessary during
reassembly to carry out the tightening torques,
adjustments and tests described below.

A . General
Engine/GBA 10 gearbox splitting is to be carried out
while maintaining the cab integral with the rear axle.
This operation is needed when access to the following
main elements is required for servicing:
• Engine interface :
- vibration damper,
- engine flywheel,
- engine adapter plate;
• Gearbox interface :
- spacer, cover and sealing ring,
- hydraulic pipes internal to the spacer,
- PowerShuttle and Dynashift.
IMPORTANT: This section presents a general disassembly procedure. Before and during disassembly,
check that all connections have been properly separated between the fixed assembly and mobile
assembly.

Massey Ferguson 6400 - Issue 4.a

¤ H

2B21.3

Splitting the Sisu engine/GTA1030

B . Disassembly
Preliminary operations
1. Apply the handbrake.
2. Check that the suspended front axle is in lowered
position (if fitted).
3. Remove the bleed screw from the control unit (if
fitted, see chapter 9).
4. Take off:
- the side panels either side of the engine,
- the bonnet.

Servicing under the tractor
5. Mark then disconnect the two ends of the hoses
fixed to the 4 WD transmission shaft guards (front
and rear). Block their openings.
6. Remove the guards and 4 WD transmission shaft.

Servicing at the front of the tractor
7. Remove the front weights (if fitted).

Servicing on the right-hand side of the
tractor
8. Disconnect the batteries.
9. Take off:
- the front mudguard;
- the vertical exhaust assembly (including support)
(Fig. 1);
- the side engine reinforcement;
- the footstep (if necessary).
10. Disconnect the flexible particle suction sleeve (1)
(Fig. 2) between the air filter and the exhaust.
11. Mark and disconnect the starter electrical harness.
12. Remove the starter (if necessary).

MA-02-05125A

Fig. 1

1

MA-02-05126A

2B21.4

Â¤ H

Fig. 2

Massey Ferguson 6400 - Issue 4.a

Splitting the Sisu engine/GTA1030
Servicing on the left-hand side of the
tractor
13. Remove the front mudguard.
14. Depending on the case:
- either move the fuel tank apart;
- or, if necessary, remove the fuel tank in the
following manner:
- previously drain it partially of its fuel,
- mark and disconnect its fuel gauge harness
and vent hose,
- Remove the tank.
15. Remove the side engine reinforcement.
16. Mark then disconnect:
- The lubrication pipes/hoses (1) located on the
cab front firewall (Fig. 3). These pipes/hoses
allow for oil flowing between the cooler and the
rear axle right-hand hydraulic cover;
- the rigid pipes (1) (Fig. 4) (pressure, return and
LS) to the suspended front axle (if fitted);
- the rigid pipes (2) (Fig. 4) to the front linkage (if
fitted).
- the gas-oil supply and return hoses on the
engine. Block their openings.

1

1

Fig. 3

MA-02-05127A

MA-02-05113A

1

Massey Ferguson 6400 - Issue 4.a

Â¤ H

2

Fig. 4

2B21.5

Splitting the Sisu engine/GTA1030
Servicing under the cab
17. Mark the heating hoses (1) (Fig. 5) at the base of
the cab right-hand pillar.
Pinch them both upstream and downstream of the
square unions (2) (Fig. 5) in order to keep fluid loss
to a minimum.

18.

DANGER: To perform the following
operation, the engine must be cold. Opening
the pressurised cooling circuit can lead to
splashing of hot fluid and cause serious burns.
If you need to perform servicing immediately
(on a hot engine), ensure you are wearing
appropriate protective clothing (goggles and
gloves) and loosen the expansion tank plug
progressively.

2
1

MA-02-05128A

Fig. 5

Disconnect the heating hoses. Block the openings.

Servicing the engine
19. Mark and disconnect the ENG4 connector from the
main harness at the rear of the engine (Fig. 6).
20. Detach the air conditioning compressor,
condenser and filter from their respective
supports. Carefully keep them apart without
opening the circuit (see chapter 12).
IMPORTANT: If the air conditioning circuit should be
open, see chapter 12 before any action.

ENG4

MA-02-05129A

2B21.6

Â¤ H

Fig. 6

Massey Ferguson 6400 - Issue 4.a

Splitting the Sisu engine/GTA1030
Servicing at the front of the cab
21. Disconnect the ENG1 and ENG2 connectors
located on the left-hand side of the cab firewall
(Fig. 7).
22. If necessary, mark and disconnect (Fig. 8):
- the hose on the steering unit (Orbitol) to the
left-hand steering ram union. Block its opening;
- the hose on the steering unit (Orbitol) to the
right-hand steering ram union. Block its opening.

ENG1

ENG2

MA-02-05130A

Fig. 7

MA-02-05131A

Massey Ferguson 6400 - Issue 4.a

Â¤ H

Fig. 8

2B21.7

Splitting the Sisu engine/GTA1030
Preparing for disassembling
23. Cancel the front axle oscillation (all versions) by
sliding a suitable chock in at each side of the front
frame (1) (Fig. 9).
24. Chock the rear wheels.
25. Install (Fig. 11):
- a fixed stand at the front of the gearbox,
- a mobile stand at the back of the engine.
26. If necessary, split the cab from the front right- and
left-hand supports. Gently lift it using two straps
fitted to the lateral handles. Temporarily chock the
cab by sliding a suitable chock under each of its
supports.

28. Split the assemblies with the help of an operator
(Fig. 11). When disassembling, check that connections (hoses, pipes and harnesses) are all disconnected.

2B21.8

Â¤ H

Massey Ferguson 6400 - Issue 4.a

Splitting the Sisu engine/GTA1030

1

1

1

1

1

2

2

3

3
MA-02-05133A

MA-02-05134A

Massey Ferguson 6400 - Issue 4.a

Â¤ H

2

2

2

3

2

3
Fig. 10

Fig. 11

2B21.9

Splitting the Sisu engine/GTA1030

C . Reassembly
29. Clean the mating faces of the engine and the
gearbox spacer.
30. Check the presence of locating pins on the
gearbox spacer.
NOTA: During assembly, these pins fit into the drill
holes (1) on the engine adapter plate (Fig. 12).
31. Lightly smear the splines of mainshaft (1) (Fig. 13)
with AS767 graphite grease or equivalent.
32. Grease the mating face of the spacer with
Loctite 5206 or equivalent.
33. Screw two diametrically opposed guide studs on
to the spacer.
34. Assemble the engine onto the gearbox spacer.
If necessary, manually turn the flywheel ring gear
using the port provided to fit the starter, using a
suitable locally made tool. This eases the engagement of the vibration damper splines with those of
the gearbox mainshaft. If there is resistance, do
not force it and find the cause of the problem.
35. Once the engine and gearbox are assembled,
remove the guide studs.
Lightly smear the thread of the screws (1) (2) with
Loctite 270 or equivalent.
Fit the screws and nuts as marked during removal
(Fig. 10). Tighten them to a torque of:
- screws (1): 240 - 320 Nm;
- screws (2): 630 - 840 Nm;
- nuts (3) with washers: 630 - 840 Nm.

1

MA-02-05135A

Fig. 12

Fig. 13

2B21.10

Â¤ H

Massey Ferguson 6400 - Issue 4.a

Splitting the Sisu engine/GTA1030
Final operations
Final operations are not especially difficult. They therefore will be carried out in the reverse order of the
preliminary operations.
However, the following operations need to be
performed during refitting:
- if necessary, tighten the cab front silent block
screws at the require tightening torque (see
chapter 12);
- top up the level of coolant, to the maximum level
marked on the expansion tank (Fig. 14);
- test:
- the air conditioning system (if fitted - see
chapter 12);
- the suspended front axle (if fitted, see chapter 8),
- all mechanical, hydraulic, electrical and electronic
functions concerned by servicing;
- check the tightness:
- of the hydraulic unions,
- of water hoses,
- of the bleed screw on control unit of suspended
front axle (if fitted).

Massey Ferguson 6400 - Issue 4.a

Â¤ H

MAX
MIN

MA-02-05124A

Fig. 14

2B21.11

Splitting the Sisu engine/GTA1030

2B21.12

Â¤ H

Massey Ferguson 6400 - Issue 4.a

Splitting - GBA20 gearbox / Centre housing

02C01 - Splitting - GBA20 gearbox / Centre housing

CONTENTS
A . General......................................................................................................................... 2
B . Disassembling and reassembling with the cab fixed to the centre housing......... 3
C . Disassembling and reassembling with the cab fixed to the gearbox................................... 10

Massey Ferguson 6400 - Issue 1

Â¤ H

02C01.1

Splitting - GBA20 gearbox / Centre housing

A . General
There are two procedures for disassembling the
gearbox and the centre housing, depending on the
type of operation to be carried out on the tractor.

Disassembling with the cab fixed to the
gearbox
Accessible element:
• Bevel gear
Remark
Due to the different hydraulic equipment that may be
fitted on the tractor, this section describes the general
disassembly procedure. Before and during disassembly, check that all connections have been properly
separated between the fixed assembly and mobile
assembly.

02C01.2

¤ H

Massey Ferguson 6400 - Issue 1

Splitting - GBA20 gearbox / Centre housing

B . Disassembling and reassembling
with the cab fixed to the centre
housing
Disassembling
Preliminary operations
1. Engage the handbrake.
2. Check that the suspended front axle (if fitted) is in
low position and unscrew the control unit bleed
screw (see chapter 9).
3. Remove the lateral panels from each side of the
engine and bonnet (if necessary).
4. Place the rear wheels in the wide track position.
5. Remove the footsteps.

Servicing under the tractor
6. Remove the guards and the 4WD shafts.
7. Drain the oil from the gearbox and centre housing.
8. Remove the reverse shuttle lubricating pipe (1)
located between the centre housing and gearbox
(Fig. 1).

Servicing on the right-hand side of the
tractor
9. Disconnect and remove the batteries.
10. Remove the battery support.
11. Mark then disconnect:
- the hose on the steering ram
- the main pipe (17 bar) at the selection cover
- the front differential lock hose on the right-hand
hydraulic cover
- the return hoses on the selector cover
- the power brake on the accumulator 17 bar
supply line (depending on equipment)
- the lubricating hoses (running to and from the
cooler)
- the gear cables on the selector cover
- creeper gear cables (optional)

Fig. 1

Special point (Fig. 2)
On tractors fitted with creeper gears:
- Remove screw (1)
- Pull the pin (2) outwards in order to free the “D”
finger of the fork.

Servicing on the left-hand side of the
tractor
13. Mark then disconnect:
- the hose on the steering ram
- the harness of the fuel gauge on the tank
- the gas oil feed and return hoses on the engine
(block ports immediately)
- the vent hose on the tank
14. Drain the tank (if necessary) and remove it.
15. Disconnect the transmission lubricating pipe or
hose located at the front left-hand side of the
gearbox.

Servicing under the cab
16. Mark, toe-in and disconnect the heating hoses,
immediately blocking the ports.

Servicing on the engine
17. Disconnect the connector of the main engine
wiring harness.
18. Disconnect the throttle control cable on the injection pump (4-cylinder engine only).
19. Separate the compressor, the condenser and the
filter from their respective holders, and remove
them carefully, without breaking the circuit.
Remark
Work carefully.

Fig. 3

Preparing for disassembling
20. Cancel the front axle oscillation (all versions) by
sliding an suitable chock in at each side of the
support (1) (Fig. 3).
21. Chock the rear wheels.
22. Place fixed stands (Fig. 5):
- At the front of the centre housing.
- To the rear of the hitch hook.
23. Position a mobile stand at the back of the gearbox
(Fig. 5).
24. Separate the cab from the supports on the front
right- and left-hand sides (fixed or suspended cab
versions – see chapter 12).
25. Gently lift it using two straps fitted to the lateral
handles.
26. Fit a wooden chock temporarily between the cab
and the front supports.

Splitting - GBA20 gearbox / Centre housing
28. With the help of an operator, separate the assemblies (Fig. 5).
Reminder
- During disassembling, check that connections
(hoses and harnesses) are all disconnected.
29. Place the appropriate stands under the cab
supports.

On the centre housing
31. Check the presence of locating pins (4) (Fig. 6).
Remark
The pins are “force” fitted.
32. Position the spring (1) in the PTO clutch (Fig. 7).
33. Smear the mating face of the centre housing with
Loctite 5206 or equivalent, avoiding the hare and
tortoise ports.
34. Replace the O'rings (2) (Fig. 7).
35. Screw two diametrically opposed guide studs into
the centre housing.

Fig. 6

Fig. 7

Massey Ferguson 6400 - Issue 1

¤ H

02C01.7

Splitting - GBA20 gearbox / Centre housing
On the gearbox
36. check the presence and correct positioning of the
PTO shaft.
37. Check:
Version with no creeper unit
- Presence of the union shaft (1) composed of the
sleeves (2) and double pins (3) (Fig. 8).
Version with creeper unit
- Correct assembly of shaft (1) composed of
sleeve (2) and double pin (3) (Fig. 9).
- Correct operation of the control mechanism (fork
and coupler) in each position.
38. Push the fork (4) towards the front of the gearbox
in direct drive position (Fig. 9).

On the centre housing
Remark
The rotation of the control finger “D” of the creeper
gears is limited by the presence of the studs and nuts
assembly (1) in the centre housing. (Tractors with
closed centre hydraulic equipment - Fig. 10).
39. Pull the pin (2) outwards (Fig. 2) and direct the “D”
finger towards the front of the centre housing (Fig.
10).
40. Couple the gearbox to the centre housing.
Reminder
If there is resistance when moving the elements
(gearbox, centre housing) together, do not force them,
and find the cause of the problem.
41. When the elements are joined, remove the guide
studs. Insert the screws (1) according to the markings made at disassembly (Fig. 4) and tighten to a
torque of 155 to 195 Nm.

Fig. 9

02C01.8

¤ H

Massey Ferguson 6400 - Issue 1

Splitting - GBA20 gearbox / Centre housing
Final operations
Remarks
Final operations are quite simple, and should therefore
be carried out in the reverse order to preliminary operations. However, it will be necessary during reassembly to carry out the tightening torques,
adjustments and tests described below.
Reminder
Engage the “D” finger (Fig. 10) in the creeper gear fork
and position the seal on the screw (2) (Fig. 10) after
lightly smearing it with Loctite 242 or equivalent.
Moderately tighten the screw.

C . Disassembling and reassembling
with the cab fixed to the gearbox
Disassembling
Remark
The disassembly procedure with cab fixed to gearbox
is almost identical to that described at Â§ B.
However, it is necessary to add all disassembly operations concerning the centre housing in order to make
the rear axle mobile and carry out disassembly in the
correct conditions.

Preliminary operations
42. Engage the handbrake.
43. Check that the suspended front axle (if fitted) is in
low position and unscrew the control unit bleed
screw (see chapter 9).
44. Remove the lateral panels from each side of the
engine and bonnet (if necessary).
45. Place the rear wheels in the wide track position.
46. Remove the footsteps.

Servicing under the tractor
47. Remove the guards and the 4WD shafts.
48. Drain the oil from the gearbox and centre housing.
49. Remove the reverse shuttle lubricating pipe (1)
located between the centre housing and gearbox
(Fig. 11).

Servicing on the right-hand side of the
tractor

Fig. 11

50. Disconnect and remove the batteries.
51. Remove the battery support.
52. Mark then disconnect:
- the cooler lubricant hose on the right-hand
hydraulic cover
- the main pipe (17 bar) at the selector cover
- the front differential lock hose on the right-hand
hydraulic cover
- the hoses joined to the cab on the right-hand
hydraulic cover
- the speed sensor connector
- the linkage sensor connector
- the return hoses on the selector cover
- the creeper gear cables (optional)

02C01.10

Â¤ H

Massey Ferguson 6400 - Issue 1

Splitting - GBA20 gearbox / Centre housing
Special point (Fig. 12)
On tractors fitted with creeper gears:
- Remove screw (1).
- Pull the pin (2) outwards in order to free the “D”
finger of the fork.
53. Mark then disconnect:
- the electrical connectors on the selector cover,
the control unit (Dynashift – reverse shuttle) and
the right-hand hydraulic cover

Servicing on the left-hand side of the
tractor
Mark then disconnect:
- the harness of the fuel gauge on the tank
- the gas oil feed and return hoses on the engine
(block ports immediately)
- the vent hose on the tank

Fig. 12

54. Drain the tank (if necessary) and remove it.
55. Disconnect the transmission lubricating pipe or
hose located at the front left-hand side of the
gearbox.

Servicing at the rear of the tractor
57. Mark and disconnect cables:
- of the auxiliary spool valves (optional)
- of the power take-off (all versions)
58. Mark and disconnect the connectors:
- on the electrohydraulic spool valves
- on the lift control valve
- on the power take-off
- on the effort sensors

Preparing for disassembling

61. Position a fixed stand at the back of the gearbox
(Fig. 15).
62. Position a mobile stand at the front of the centre
housing and another at the back (Fig. 15).
63. Separate the cab from the supports on the rear
right- and left-hand sides (fixed or suspended cab
versions – see chapter 12).
64. Using two straps with hooks, gently lift the cab
with the rear pillars (Fig. 15).
65. Fit a wooden chock temporarily between the cab
and the pillars.

59. Cancel the front axle oscillation (all versions) by
sliding a suitable chock in either side of the support
(1) (Fig. 13).
60. Chock the front wheels.

On the centre housing
70. Check the presence of locating pins (4) (Fig. 16).
Remark
The pins are “force” fitted.
71. Position the spring (1) in the PTO clutch. (Fig. 17).
72. Smear the mating face of the centre housing with
Loctite 5206 or equivalent, avoiding the hare and
tortoise ports.
73. Replace the O'rings (2) (Fig. 17).
74. Screw two diametrically opposed guide studs into
the centre housing.

Fig. 16

Fig. 17

02C01.14

¤ H

Massey Ferguson 6400 - Issue 1

Splitting - GBA20 gearbox / Centre housing
On the gearbox
75. Check the presence and correct positioning of the
PTO shaft.
76. Check:
Version with no creeper unit
- Presence of the union shaft (1) composed of the
sleeves (2) and double pins (3) (Fig. 18).
Version with creeper unit.
- Correct assembly of shaft (1) composed of
sleeve (2) and double pin (3) (Fig. 19).
- Correct operation of the control mechanism (fork
and coupler) in each position.
77. Push the fork (4) towards the front of the gearbox
in direct drive position (Fig. 19).

On the centre housing
Remark
The rotation of the control finger “D” of the creeper
gears is limited by the presence of the studs and nuts
assembly (1) in the centre housing (tractors with
closed centre hydraulics - Fig. 20).
78. Pull the pin (2) outwards (Fig. 12) and direct the
“D” finger towards the front of the centre housing
(Fig. 20).
79. Couple the gearbox to the centre housing.
Reminder
If there is resistance when moving the elements
(gearbox, centre housing) together, do not force them,
and find the cause of the problem.
80. When the elements are joined, remove the guide
studs. Insert the screws (1) according to the markings made at disassembly (Fig. 14) and tighten to a
torque of 155 to 195 Nm.

Fig. 19

Massey Ferguson 6400 - Issue 1

¤ H

02C01.15

Splitting - GBA20 gearbox / Centre housing
Final operations
Remarks
Final operations are quite simple, and should therefore
be carried out in the reverse order to preliminary operations. However, it will be necessary during reassembly to carry out the tightening torques,
adjustments and tests described below.
Reminder
Engage the “D” finger (Fig. 20) in the creeper gear fork
and position the seal on the screw (2) (Fig. 20) after
lightly smearing it with Loctite 242 or equivalent.
Moderately tighten the screw.

CONTENTS
A . General......................................................................................................................... 2
B . Disassembling and reassembling with the cab fixed to the centre housing......... 3
C . Disassembling and reassembling with the cab fixed to the gearbox.............................. 10

Massey Ferguson 6400 - Issue 1

Â¤ H

02C02.1

Splitting - GBA10 gearbox / Centre housing

A . General
There are two procedures for disassembling the
gearbox and the centre housing, depending on the
type of operation to be carried out on the tractor.

Disassembling with the cab fixed to the
gearbox
Accessible element
• Bevel gear
This section presents a general disassembly procedure. Before and during disassembly, check that all
connections have been properly separated between
the fixed assembly and mobile assembly.

02C02.2

¤ H

Massey Ferguson 6400 - Issue 1

Splitting - GBA10 gearbox / Centre housing

B . Disassembling and reassembling
with the cab fixed to the centre
housing
Preliminary operations
1. Manually disengage the Park Lock mechanism
(see chapters 9 and 11).
2. Apply the parking brake.
3. Check that the suspended front axle is in low position (if fitted).
4. Remove the side panels either side of the engine
and the bonnet (if necessary).
5. Place the rear wheels in the wide track position.
6. Remove the footsteps.

Servicing under the tractor
7. Remove the chassis reinforcements (if fitted, see
chapter 2).
8. Remove the guard and the 4WD shafts.
9. Drain the oil from the gearbox and centre housing.
10. Remove:
- the 4WD cover located at the rear end of the
gearbox.
- the reverse shuttle lubricating pipe (1) located
between the centre housing and gearbox (Fig. 1).

Servicing on the right-hand side of the
tractor
11. Mark then disconnect:
- the hose on the steering ram,
- the battery cables,
- the lubricating hoses (running to and from the
cooler),
- the main pipe (17 bar) on the selector cover,
- the front differential lock hose on the right-hand
hydraulic cover,
- the return hoses on the selector cover,
- the power brake hose on the accumulator 17 bar
supply line,
- the gear cables on the selector cover,
- the creeper cable (if fitted),
- the electrical connectors on the selector cover,
the control unit (Dynashift - reverse shuttle),
- the radar (if fitted).

Massey Ferguson 6400 - Issue 1

Â¤ H

Fig. 1

02C02.3

Splitting - GBA10 gearbox / Centre housing
Servicing on the left-hand side of the
tractor
12. Mark then disconnect:
- the hose on the steering ram,
- the harness of the fuel gauge on the tank,
- the fuel feed and return hoses on the engine
(block ports),
- the vent hose on the tank.
13. Drain the tank (if necessary) and remove it.
14. Disconnect the lubricating pipe located at the front
left-hand side of the gearbox.

Servicing under the cab
15. Mark, toe-in and disconnect the heating hoses,
immediately blocking the ports.

Fig. 2

Servicing the engine
16. Disconnect the connector of the main engine
wiring harness.
17. Separate the compressor, the condenser and the
filter from their respective holders, and remove
them carefully, without breaking the circuit.

Preparing for disassembling
18. Cancel the front axle oscillation by sliding an suitable chock in at each side of the support (1) (Fig. 2).
19. Chock the rear wheels.
20. Remove the two lower screws (6) (M16) from the
4WD cover opening (Fig. 3).
21. Place fixed stands (Fig. 4):
- at the front of the centre housing.
- to the rear of the hitch hook.
22. Position a mobile stand at the back of the gearbox
(Fig. 4).
23. Separate the cab from the supports on the front
right- and left-hand sides (see chapter 12).
24. Gently lift it using two straps fitted to the lateral
handles.
25. Place a block temporarily between the cab and the
front supports.

Disassembly
26. Remove the remaining screws and nuts fixing the
gearbox to the centre housing (Fig. 3). Mark their
lengths and positionings.

02C02.4

Â¤ H

Massey Ferguson 6400 - Issue 1

Splitting - GBA10 gearbox / Centre housing

Fig. 3

Massey Ferguson 6400 - Issue 1

Â¤ H

02C02.5

Splitting - GBA10 gearbox / Centre housing
27. With the help of an operator, separate the assemblies (Fig. 4).
Reminder
During disassembly, check that connections
(hoses and harnesses) are all disconnected.
28. Place the suitable stands under the cab supports.

MA-02-06016A

02C02.6

Â¤ H

Fig. 4

Massey Ferguson 6400 - Issue 1

Splitting - GBA10 gearbox / Centre housing
Reassembly
29. Clean the mating surfaces of the gearbox and the
centre housing.
30. Check the presence of locating pins (4) on the
gearbox (Fig. 3).
Remark
The pins are “force” fitted.
31. Check that the studs (2) are in good condition (Fig.
3) and are correctly fitted to the centre housing.
32. Check the presence and correct positioning of the
PTO shaft in the gearbox.
33. Smear the spring (1) with miscible grease and fit it
on the shaft collar (2) (Fig. 5).
34. Smear the mating face of the centre housing with
Loctite 5206 or equivalent (Fig. 3).
35. Screw two diametrically opposed guide studs into
the centre housing.
36. Check:
• Version with no creeper unit
- The presence of the locking ring (1) on the
drive pinion (Fig. 6).
- The correct positioning of the sleeve (2) on the
drive pinion (Fig. 6).
• Version with creeper unit
- The presence of locking rings (1) on the drive
pinion and the gearbox output shaft (Fig. 7).
- The correct operation of the control mechanism (fork, selector rail and coupler) in each
position.

Splitting - GBA10 gearbox / Centre housing
Final operations
Remarks
Final operations are quite simple, and should therefore
be carried out in the reverse order to preliminary operations. However, it will be necessary during reassembly to carry out the tightening torques,
adjustments and tests described below.

C . Disassembling and reassembling
with the cab fixed to the gearbox
Remark
The disassembly procedure with cab fixed to gearbox
is almost identical to that described at Â§ B.
However, it is necessary to add all disassembly operations concerning the centre housing in order to make
the rear axle mobile and carry out disassembly in the
correct conditions.

Servicing on the left-hand side of the
tractor
49. Mark then disconnect:
- the harness of the fuel gauge on the tank
- the fuel feed and return hoses on the engine
(block ports),
- the vent hose on the tank.
- Drain the tank (if necessary) and remove it.
- Disconnect the lubrication tube located at the
front left-hand side of the gearbox.

Servicing under the tractor
44. Remove the chassis reinforcements (if fitted, see
chapter 2).
45. Remove the guard and the 4WD shaft.
46. Drain the oil from the gearbox and centre housing.
47. Remove:
- the 4WD cover located under the back of the
gearbox.
- the reverse shuttle lubricating pipe (1) located
between the centre housing and gearbox (Fig. 8).

Servicing on the right-hand side of the
tractor
48. Mark then disconnect:
- the battery cables,
- the lubricating hoses (running to and from the
cooler),
- the main pipe (17 bar) on the selector cover,
- the front differential lock hose on the right-hand
hydraulic cover,
- the creeper cable (if fitted),
- the electrical cables on the right-hand hydraulic
cover and the filter,
- the hydraulic hoses joined to the cab on the righthand hydraulic cover,
- the engine speed sensor connector,
- the linkage sensor connector.

61. Remove the remaining screws and nuts attaching
the centre housing to the gearbox (Fig. 10). Mark
their lengths and positionings.

Servicing at the rear of the tractor
51. Mark then disconnect:
- the auxiliary spool valve control cables
(depending on version) and 540 - 1000 rpm PTO
control cables,
- the 750 rpm PTO cables and GSPTO cables (if
fitted),
- The connectors on the electrohydraulic spool
valves, the lift control spool valve and the rear
PTO housing,
- the draft sensors.
52. Remove the drawbars, lift rods and stabilisers.

Fig. 9

Preparing for disassembling
53. Stop the front axle oscillation by sliding a suitable
chock either side of the support (1) (Fig. 9).
54. Chock the front wheels.
55. Remove the two lower screws (6) (M16) from the
4WD cover opening (Fig. 10).
56. Position a fixed stand at the back of the gearbox
(Fig. 11).
57. Position a mobile stand at the front of the centre
housing and another at the back (Fig. 11).
58. Separate the cab from the supports on the rightand left-hand sides (see chapter 12).
59. Using two straps with hooks, gently lift the cab
with the rear pillars (Fig. 11).
60. Place a block temporarily between the cab and the
rear supports.

Splitting - GBA10 gearbox / Centre housing
Reassembly
64. Clean the mating surfaces of the gearbox and the
centre housing.
65. Check the presence of locating pins (4) on the
gearbox (Fig. 10).
Remark
The pins are “force” fitted.
66. Check that the studs (2) are in good condition (Fig.
10) and are correctly fitted to the centre housing.
67. Check the presence and correct positioning of the
PTO shaft in the gearbox.
68. Smear the spring (1) with miscible grease and fit it
on the shaft collar (2) (Fig. 12).
69. Smear the mating face of the centre housing with
Loctite 5206 or its equivalent (Fig. 10).
70. Screw two diametrically opposed guide studs into
the centre housing.
71. Check:
• Version with no creeper unit
- The presence of the locking ring (1) on the
drive pinion (Fig. 13).
- The correct positioning of the sleeve (2) on the
drive pinion (Fig. 13)
• Version with creeper unit
- The presence of locking rings (1) on the drive
pinion and the gearbox output shaft (Fig. 14).
- The correct operation of the control mechanism (fork, selector rail and coupler) in each
position.
72. Couple the centre housing to the gearbox.
Reminder
If there is resistance when moving the elements
(gearbox, centre housing) together, do not force
them, and find the cause of the problem.

Splitting - GBA10 gearbox / Centre housing
Final operations
Remark
Final operations are quite simple, and should therefore
be carried out in the reverse order to preliminary operations. However, it will be necessary during reassembly to carry out the tightening torques,
adjustments and tests described below.

Disassembly with the cab fixed to the
gearbox
Accessible element:
• Crownwheel and pinion.
NOTE: Due to the various types of hydraulic equipment
that may be fitted onto the tractor, this section
describes the general disassembly procedure. Before
and during disassembly, check that all connections
between the fixed assembly and mobile assembly
have been disconnected.

Massey Ferguson 6400 - Issue 4.a

¤ H

2C30.3

GBA25/GPA20 separation

B . Disassembly and reassembly
with the cab fixed to the centre
housing
Disassembly
Implementation
1. Apply the handbrake.
2. Check that the suspended front axle (if fitted) is in
low position and unscrew the control unit bleed
screw (see chapter 9).
3. Remove the lateral panels from each side of the
engine and bonnet (if necessary).
4. Place the rear wheels in the wide track position.
5. Remove the footsteps.

Operations on the right-hand side of the
tractor
9. Disconnect and remove the batteries.
10. Remove the battery support.
11. Mark then disconnect:
- the hose on the steering ram
- the main tube (20 bar) to the gearbox control
block (Fig. 1)
- the front differential lock hose on the right-hand
hydraulic cover
- the return hoses on the selector cover
- the brake hose on the accumulator 20 bar supply
line (depending on equipment)
- the lubricating hoses (running to and from the
cooler depending on the model)
- the creeper gear cables (optional)

GBA25/GPA20 separation
12. Mark then disconnect:
- the electrical connectors on the gearbox control
block and the right hydraulic cover
- the radar (if fitted).

Operations on the left-hand side of the
tractor
13. Mark then disconnect:
- the hose on the steering ram
- the harness of the fuel gauge on the fuel tank
- the fuel feed and return hoses on the engine
(block ports immediately)
- the vent hose on the fuel tank.
14. Drain the fuel tank (if necessary) and remove it.
15. Disconnect the lubrication hose from the flared
tube located to the left of the gearbox.
16. Remove the lubrication tube from the transmission
situated between the left side of the gearbox and
the right cover of the centre housing.

Fig. 3

Operations under the cab
17. Mark, pinch out and disconnect the heating hoses,
blocking the ports immediately.
18. The hose between the cooler and the thermostat
valve.

Operations on the engine
19. Disconnect the connector of the main engine
wiring harness.
20. Disconnect the throttle control cable on the
injection pump (four-cylinder engine only).
21. Separate the compressor, the condenser and the
filter from their respective holders and remove
them carefully without breaking the circuit.
NOTE: Proceed carefully.

Preparing for disassembly
22. Stop the front axle swinging (all versions) by sliding
a suitable chock in at each side of the support (1)
(Fig. 3).

Massey Ferguson 6400 - Issue 4.a

Â¤ H

2C30.5

GBA25/GPA20 separation

1

1

1

1

MA-02-03013A

Fig. 4

2C30.6

Â¤ H

Massey Ferguson 6400 - Issue 4.a

GBA25/GPA20 separation
23. Chock the rear wheels.
24. Place fixed stands (Fig. 5):
- at the front of the centre housing
- to the rear of the hitch hook.
25. Position a mobile stand at the rear of the gearbox
(Fig. 5).
26. Separate the cab from the supports on the front
right and left-hand sides (fixed or suspended cab
versions—see chapter 12).
27. Gently lift the cab using two straps fitted to the
lateral handles.
28. Temporarily fit a wooden chock between the cab
and the front supports.

Disassembly
29. Remove each screw (1) fixing the gearbox to the
centre housing (Fig. 4) and marking its position.